Its newly grown legs prevent it from running. It appears to prefer swimming than trying to stand.

Blue

Yellow

The direction of the spiral on the belly differs by area. It is more adept at swimming than walking.

Gold

Because it is inept at walking on its newly grown legs, it always swims around in water.

Silver

The direction of its belly spiral differs by area. The equator is thought to have an effect on this.

Crystal

The swirl on its belly is its insides showing through the skin. It looks clearer after it eats.

Ruby

POLIWAG has a very thin skin. It is possible to see the POKÉMON's spiral innards right through the skin. Despite its thinness, however, the skin is also very flexible. Even sharp fangs bounce right off it.

Sapphire

Emerald

It is possible to see this POKÉMON's spiral innards right through its thin skin. However, the skin is also very flexible. Even sharp fangs bounce right off it.

FireRed

Its slick black skin is thin and damp. A part of its internal organs can be seen through the skin as a spiral pattern.

LeafGreen

Its newly grown legs prevent it from running. It appears to prefer swimming than trying to stand.

Diamond

Its skin is so thin, its internal organs are visible. It has trouble walking on its newly grown feet.

Pearl

Platinum

Its skin is so thin, its internal organs are visible. It has trouble walking on its newly grown feet.

HeartGold

Because it is inept at walking on its newly grown legs, it always swims around in water.

SoulSilver

The direction of its belly spiral differs by area. The equator is thought to have an effect on this.

Black

Its skin is so thin, its internal organs are visible. It has trouble walking on its newly grown feet.

White

Black 2

Its skin is so thin, its internal organs are visible. It has trouble walking on its newly grown feet.

White 2

X

Its slick black skin is thin and damp. A part of its internal organs can be seen through the skin as a spiral pattern.

Y

The direction of the spiral on the belly differs by area. It is more adept at swimming than walking.

Sun

The swirl on its belly is its internal organs showing through. If the swirl is tinged white, that means it's affected by some disease.

Moon

It's still not very good at walking. Its Trainers should train this Pokémon to walk every day.

Stadium 1

The spiral on its belly is its internal organs seen through its thin skin. It is better at swimming than walking.

Stadium 2

Because it is inept at walking on its newly grown legs, it always swims around in water.